/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.coyote.http11.filters;

import java.io.IOException;
import org.apache.coyote.Request;
import org.apache.coyote.InputBuffer;
import org.apache.coyote.http11.InputFilter;
import org.apache.tomcat.util.buf.ByteChunk;

/**
 * Input filter responsible for reading and buffering the request body, so that
 * it does not interfere with client SSL handshake messages.
 */
public class BufferedInputFilter implements InputFilter {

	// -------------------------------------------------------------- Constants

	private static final String ENCODING_NAME = "buffered";
	private static final ByteChunk ENCODING = new ByteChunk();

	// ----------------------------------------------------- Instance Variables

	private ByteChunk buffered = null;
	private ByteChunk tempRead = new ByteChunk(1024);
	private InputBuffer buffer;
	private boolean hasRead = false;

	// ----------------------------------------------------- Static Initializer

	static {
		ENCODING.setBytes(ENCODING_NAME.getBytes(), 0, ENCODING_NAME.length());
	}

	// --------------------------------------------------------- Public Methods

	/**
	 * Set the buffering limit. This should be reset every time the buffer is
	 * used.
	 */
	public void setLimit(int limit) {
		if (buffered == null) {
			buffered = new ByteChunk(4048);
			buffered.setLimit(limit);
		}
	}

	// ---------------------------------------------------- InputBuffer Methods

	/**
	 * Reads the request body and buffers it.
	 */
	public void setRequest(Request request) {
		// save off the Request body
		try {
			while (buffer.doRead(tempRead, request) >= 0) {
				buffered.append(tempRead);
				tempRead.recycle();
			}
		} catch (IOException iex) {
			// Ignore
		}
	}

	/**
	 * Fills the given ByteChunk with the buffered request body.
	 */
	public int doRead(ByteChunk chunk, Request request) throws IOException {
		if (hasRead || buffered.getLength() <= 0) {
			return -1;
		} else {
			chunk.setBytes(buffered.getBytes(), buffered.getStart(), buffered
					.getLength());
			hasRead = true;
		}
		return chunk.getLength();
	}

	public void setBuffer(InputBuffer buffer) {
		this.buffer = buffer;
	}

	public void recycle() {
		if (buffered != null) {
			if (buffered.getBuffer().length > 65536) {
				buffered = null;
			} else {
				buffered.recycle();
			}
		}
		tempRead.recycle();
		hasRead = false;
		buffer = null;
	}

	public ByteChunk getEncodingName() {
		return ENCODING;
	}

	public long end() throws IOException {
		return 0;
	}

	public int available() {
		return buffered.getLength();
	}

}
